/*
   Copyright 2015 Shlomi Noach, courtesy Booking.com

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package inst

import (
	"strings"
)

// OracleGtidSet represents a set of GTID ranges as depicted by Retrieved_Gtid_Set, Executed_Gtid_Set or @@gtid_purged.
type OracleGtidSet struct {
	GtidEntries [](*OracleGtidSetEntry)
}

// Example input:  `230ea8ea-81e3-11e4-972a-e25ec4bd140a:1-10539,
// 316d193c-70e5-11e5-adb2-ecf4bb2262ff:1-8935:8984-6124596,
// 321f5c0d-70e5-11e5-adb2-ecf4bb2262ff:1-56`
func ParseGtidSet(gtidSet string) (res *OracleGtidSet, err error) {
	res = &OracleGtidSet{}

	gtidSet = strings.TrimSpace(gtidSet)
	if gtidSet == "" {
		return res, nil
	}
	entries := strings.Split(gtidSet, ",")
	for _, entry := range entries {
		if gtidRange, err := NewOracleGtidSetEntry(entry); err == nil {
			res.GtidEntries = append(res.GtidEntries, gtidRange)
		} else {
			return res, err
		}
	}
	return res, nil
}

// RemoveUUID removes entries that belong to given UUID.
// By way of how this works there can only be one entry matching our UUID, but we generalize.
// We keep order of entries.
func (this *OracleGtidSet) RemoveUUID(uuid string) (removed bool) {
	filteredEntries := [](*OracleGtidSetEntry){}
	for _, entry := range this.GtidEntries {
		if entry.UUID == uuid {
			removed = true
		} else {
			filteredEntries = append(filteredEntries, entry)
		}
	}
	if removed {
		this.GtidEntries = filteredEntries
	}
	return removed
}

func (this OracleGtidSet) String() string {
	tokens := []string{}
	for _, entry := range this.GtidEntries {
		tokens = append(tokens, entry.String())
	}
	return strings.Join(tokens, ",\n")
}